US

Sheriffs on horseback and police break up a group of demonstrators outside Republican U.S. presidential candidate Donald Trump's campaign rally in Costa Mesa

Mike Blake/Reuters

Sheriffs on horseback and police break up a group of demonstrators outside Republican U.S. presidential candidate Donald Trump’s campaign rally in Costa Mesa, California.

Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, center, speaks during a campaign event in New York

John Taggart/Bloomberg

Photographers in the press pen as Prime Minster David Cameron welcomes US President Barack Obama to Downing Street

Lauren Hurley/PA

Photographers in the press pen as Prime Minster David Cameron welcomes US President Barack Obama to Downing Street

Carlos Barria/Reuters

Republican U.S. presidential candidate Donald Trump’s hand is seen as he reacts during a campaign event in Harrisburg, Pennsylvania

Hillary Clinton...Democratic presidential candidate Hillary Clinton arrives at a campaign stop, Wednesday, April 20, 2016, in Philadelphia. (AP Photo/Matt Rourke)

Matt Rourke/AP

Democratic presidential candidate Hillary Clinton arrives at a campaign stop in Philadelphia 

Hillary Clinton...A Secret Service Agent stands guard as Democratic presidential candidate Hillary Clinton speaks at the Corsi senior center, Friday, April 15, 2016, in New York. (AP Photo/Mary Altaffer)

Mary Altaffer/AP

A Secret Service Agent stands guard as Democratic presidential candidate Hillary Clinton speaks at the Corsi senior center, in New York

Low-Wage Workers Strike And Rally For $15 Wage In Chicago...CHICAGO, IL - APRIL 14:  Demonstrators demanding an increase in the minimum wage to $15-dollars-per-hour prepare to march in the streets on April 14, 2016 in Chicago, Illinois. The demonstrators marched to and protested in front of several locations during a day-long effort to draw attention to low-wage jobs. The demonstration was one of about 300 scheduled to take place nationwide today.  (Photo by Scott Olson/Getty Images)

Scott Olson/Getty

Demonstrators demanding an increase in the minimum wage to $15-dollars-per-hour prepare to march in the streets on Thursday in Chicago, Illinois. The demonstrators marched to and protested in front of several locations during a day-long effort to draw attention to low-wage jobs 

Attendees cheer for Senator Ted Cruz, a Republican from Texas and 2016 presidential candidate, not pictured, during a campaign event in Milwaukee

Daniel Acker/Bloomberg

Attendees cheer for Senator Ted Cruz, a Republican from Texas and 2016 presidential candidate, not pictured, during a campaign event in Milwaukee, Wisconsin, U.S.

A man takes a photograph of the stage before a campaign event featuring Republican presidential candidate Donald Trump at St. Norbert College in De Pere, Wisconsin, USA

Patrick Semansky/AP

A man takes a photograph of the stage before a campaign event featuring Republican presidential candidate Donald Trump at St. Norbert College in De Pere, Wisconsin, USA

Dan LaMoore wheels a clock away from the test area as it is prepared to be shipped to a Tennessee school at the Electric Time Company in Medfield, Massachusetts.

Charles Krupa/AP

Dan LaMoore wheels a clock away from the test area as it is prepared to be shipped to a Tennessee school at the Electric Time Company in Medfield, Massachusetts.

Democratic presidential candidate Hillary Clinton speaks to an overflow crowd during a campaign event in Vernon Hills, Illinois.

Justin Sullivan/Getty Images

Democratic presidential candidate Hillary Clinton speaks to an capacity audience during a campaign event in Vernon Hills, Illinois.

Tim Ferris shades himself from the sun while waiting in line to attend a campaign rally with Democratic presidential candidate, Sen. Bernie Sanders, in Kissimmee, Florida, USA

Phelan M. Ebenhack/AP

Tim Ferris shades himself from the sun while waiting in line to attend a campaign rally with Democratic presidential candidate, Sen. Bernie Sanders, in Kissimmee, Florida, USA

Marco Rubio...Republican presidential candidate, Sen. Marco Rubio, R-Fla., poses for photographs during a campaign rally in Hialeah, Fla., Wednesday, March 9, 2016. (AP Photo/Paul Sancya)

Paul Sancya/AP

Republican presidential candidate, Senator Marco Rubio, poses for photographs during a campaign rally in Hialeah, Florida 

Barack Obama...President Barack Obama meets with members of his economic team in the Roosevelt Room of the White House in Washington, Friday, March 4, 2016. Obama spoke about U.S. employers adding 242,000 workers in February, driving another solid month for the resilient American job market.

Pablo Martinez Monsivais/AP

President Barack Obama meets with members of his economic team in the Roosevelt Room of the White House in Washington. Obama spoke about U.S. employers adding 242,000 workers in February, driving another solid month for the resilient American job market 

Oklahoma City Thunder's Kevin Durant drives to the basket between Golden State Warriors' Harrison Barnes, left, and Shaun Livingston during the second half of an NBA basketball game in Oakland, Calif.

Marcio Jose Sanchez/AP

Oklahoma City Thunder’s Kevin Durant drives to the basket between Golden State Warriors’ Harrison Barnes, left, and Shaun Livingston during the second half of an NBA basketball game in Oakland, Calif.

The plane carrying Expedition 46 Commander Scott Kelly of NASA is seen as it taxis after landing at Ellington Field after his return to Earth

Joel Kowsky/NASA via Getty Images

The plane carrying Expedition 46 Commander Scott Kelly of NASA is seen as it taxis after landing at Ellington Field after his return to Earth

Elise Amendola/AP

Voters cast ballots at a polling station for Massachusetts’ primary election, as Super Tuesday starts in North Andover, Mass USA

Hillary Clinton...Democratic presidential candidate Hillary Clinton gestures during a commercial break at a CNN town hall style televised event at the University of South Carolina School of Law, in Columbia, S.C., Tuesday, Feb. 23, 2016. (AP Photo/Gerald Herbert)

  © Gerald Herbert/AP

Democrat presidential candidate Hillary Clinton gestures during a commercial break at a CNN town hall televised event at the University of South Carolina School of Law, in Columbia, US

Protesters carry placards outside an Apple store

Steven Senne/AP

Protesters carry placards outside an Apple store in Boston to protest the FBI obtaining a court order that requires Apple to make it easier to unlock an encrypted iPhone used by a gunman in December’s shooting in San Bernardino

Julio Cortez / AP Photo

A full moon rises over the Statue of Liberty, seen from the Port Liberte neighborhood of Jersey City, N.J